[Javascript] Re: turning on checkboxes

Mon Aug 13 15:32:12 CDT 2001

I'm having trouble getting your solution working. It says 
document.memberForm.element is null or not an object. After printing 
alert 1, it fails before alert 2. Any suggestions on how I might test 
for nulls?

function selectAll(){
	for ( var i =0; i < document.memberForm.length; i++){
		alert("alert 1");
		if ( document.memberForm.element[i] != null){
			alert("alert 2");
			if ( document.memberForm.element[i].type 
== "checkbox"){
				alert("alert 3");
				document.memberForm.element
[i].checked = TRUE;
			}
		}
  	}
}

Thanks,
-Susan

------------------------Bob Filipiak -----------------------

function selectAll(){ 
  for ( var i =0; i < document.forms[0].length; i++){ 
      if ( document.forms[0].element[i].type == "checkbox"){ 
          document.forms[0].element[i].checked = TRUE; 
      } 

  } 
} 

HTH 

Bob Filipiak (Contractor) 
MCP 

-----Original Message----- 
From: susan at plonka.com [mailto:susan at plonka.com] 
Sent: Friday, August 10, 2001 10:48 AM 
To: javascript at LaTech.edu 
Subject: [Javascript] turning on checkboxes 

I'm trying to figure out how to make a "Select All checkboxes" button 
function. 

The checkboxes are generated dynamically in a loop from reading a 
database and their names correspond to the memberID. I don't know how 
many, that's dynamic too. 

I want to be able to get the checkbox names and turn them all on with 
this button. 

<script language="JavaScript"> 
        function selectAll() { 
                document.members.cb1050.checked = true 
        } 
<script> 

<body><table> <!--- SQL stuff --> 
        <% do while not connMembers.eof %> 
        <tr><td> 
                <input type="checkbox" name="<%= connMembers(0) %>"> 
        </td></tr> 
        <% connMembers.movenext 
        Loop %> 
        </table> 

        <table width="500"><tr><td width="100%" align="center"> 
        <input type="button" value="Select All" onclick="selectAll
()"> 
        </td></tr></table> 
</body> 